diff --git a/src/Enumeration/Enumeration.php b/src/Enumeration/Enumeration.php
index 0403c45..d4a72cc 100644
--- a/src/Enumeration/Enumeration.php
+++ b/src/Enumeration/Enumeration.php
@@ -212,7 +212,7 @@ final public function __serialize()
         throw new EnumerationException('Enum serialization is not allowed');
     }
 
-    final public function __unserialize()
+    final public function __unserialize($data)
     {
         throw new EnumerationException('Enum unserialization is not allowed');
     }